A copper block rests 29.3 cm from the center of a steel turn

prealm2022-10-04 11:39:542条回答

A copper block rests 29.3 cm from the center of a steel turntable.The coefficient of
static friction between block and surface is
0.476.The turntable starts from rest and rotates with a constant angular acceleration of 0.49 rad/s
The acceleration of gravity is 9.8 m/s
.After what interval will the block start to
slip on the turntable?[ Hint:Ignore the tangential component of the acceleration.]
Answer in units of s

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余风未了 共回答了22个问题 | 采纳率90.9%
开始滑动的临界条件是:μmg=mw^2r,w=sqrt(μg/r)=sqrt(0.476*9.8/0.293)=4rad/s
即当角速度w大于4rad/s时开始滑动
则开始滑动的时间t=4/0.49=8.14s
1年前
ni60 共回答了2个问题 | 采纳率
一块铜在距离一个钢转盘中心29.3厘米的位置. 铜块和转盘表面的静摩擦系数是0.476. 转盘从开始的静止不动,逐渐开始以0.49弧度/秒的恒定角加速度旋转.
重力加速度是9.8m/s
多少间隔(时间段?)之后铜块会开始在转盘上打滑(跟着旋转)?
提示:将切向分量的加速度忽略掉.
答案的单位是"s"(秒)...
1年前

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求教句子结构:The actual figure was made of copper supported by a m
求教句子结构:The actual figure was made of copper supported by a metal framework 。。。。。。
这是新概念二93课的一句(曾在这里问过,但咂摸一番还是有点不解):
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为了好问,先把我没有疑问的从句简化掉,剩下:
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the actual figure was made of copper supported by a metal framework which had been
especially constructed by Eiffel.
请问supported在这里是什么语法,一个句子不是只能有一个谓语吗,the actual figure这个主语已经有谓语be made of 了,怎么又出现一个谓语supported,那这个supported的主语到底是谁,
nvshui1年前3
lianghuicool 共回答了21个问题 | 采纳率81%
supported在这里是"过去分词做定语",修饰前面的copper----翻译是“支撑”.supported by a metal framework ------翻译是:由金属“支撑”的 -- - - .它不是谓语动词,只是做定语.谓语动词是was made of copper ------由铜做成.
the actual figure(主语) was made(谓语) of copper(宾语) supported by a metal framework (定语)which had been- - - - (这里是定语从句部分)
英语语法词汇单选题问题Silver is the best of electricity,copper ( ) it c
英语语法词汇单选题问题
Silver is the best of electricity,copper ( ) it closely
A.follow B.following C.to follow D.being followed
请问为什么选动名词?
每个1年前6
一米月光001 共回答了16个问题 | 采纳率81.3%
其实是动词现在分词,而不是动名词.
Silver is the best of electricity,copper following it closely
因为此句的谓语动词是is.而 copper following it closely是动词现在分词短语.
我明白你的困惑.其实我把上述句子拆成2个句子的话如下.
Silver is the best of electricity.Copper follows it closely.
这时就可用follows.
问题是原句是一个句子,所以后面follow就用动词现在分词短语,做非谓语动词.
anti silver, anti gold, anti copper 是什么意思?工艺品中手链用的,是不是镀银,镀金,
anti silver, anti gold, anti copper 是什么意思?工艺品中手链用的,是不是镀银,镀金,镀铜?
还有一种翻译是古银色,淡古铜色,古铜色呢? 到底是什么?
zzyyll321年前1
kofll 共回答了17个问题 | 采纳率88.2%
我是做外贸的.平时客户用
anti-silver表示古银色
anti-gold古金色
anti-copper古铜色
anti是带有做旧效果的意思,翻译过来就是 古什么什么色了
镀银用 silver-plated表示 plated表示 镀
供参考
英语翻译One day,a small boy finds a bright copper penny when wal
英语翻译
One day,a small boy finds a bright copper penny when walking down the street.He is so excited.Then he spends the rest of his life walking with his head down,eyes wide open,looking for money.
During his lifetime he finds 296 pennies and 2 dollars.But he misses out on the beauty of 31369 sunsets and 157 rainbows.He never sees the white clouds,the flying birds,the shining sun in the blue sky,and the smiles of people in his life.
DD被扑倒向的地板1年前6
酒后灌水2 共回答了19个问题 | 采纳率84.2%
一天,一个小男孩在街上走着发现了一枚发亮的铜便士,他非常高兴.后来在他的余生中他走路都是低头睁大眼睛寻找着地上的钱.
在他一生中,他找到了296美分和2美元.但他错过了31369个日落和157道彩虹的美丽.他从没欣赏洁白的云朵,飞翔的鸟儿,蓝天中烂灿的太阳,还有他生活中人们的微笑.
Ethernet-over-copper continues to ramp worldwide as carriers
Ethernet-over-copper continues to ramp worldwide as carriers see the growth potential it represents
ramp怎么翻译?
zzmm1231年前1
sttg0718 共回答了27个问题 | 采纳率92.6%
amp:上升
全句:铜缆以太网在全球继续呈上升势头,这是由于运营商看到了它的成长潜力
oxygen-free copper是什么意思
没超疯团_kazu1年前1
ll博飛 共回答了24个问题 | 采纳率83.3%
oxygen-free copper
无氧红铜;
紫铜排;
供应无氧红铜
The joints of high purity alumina ceramic and oxygen-free copper with highstrength and low gas loakage are needed in electron tube.
电真空应用中,要求高纯氧化铝与无氧铜的连接接头具有较高的强度和气密性.
很高兴第一时间为您解答,
The world's supplies of copper...
The world's supplies of copper...
a,have been gradually being exhausted
b,have gradually exhausted
c,are gradually exhausted
d,are being gradually exhausted
英雪缘1年前1
东方男孩 共回答了20个问题 | 采纳率80%
a.been和being重复
d.are和being重复
exhausted是一个持续的动作,固应用现在完成时,选B
copper-bottomed是什么意思
很深的海1年前1
nanxingke 共回答了15个问题 | 采纳率100%
copper-bottomed adj. 底包铜皮的;耐航海的;绝对安全的
亲,如有帮助,请采纳!~(≧▽≦)/~
您的采纳是我前进的动力,因为您的采纳,我们会更好、更多帮助其他人.
祝您学习工作生活顺心如意!家庭和谐美满幸福!
How is managed the price in case of indexed price on Copper
How is managed the price in case of indexed price on Copper for example?这句话怎么翻译呢?
风吹无声1年前4
回帖27 共回答了15个问题 | 采纳率93.3%
怎样管理价格,是依据铜的价格指数来确定的
急求纯手工翻译!谢谢各位!一IntroductionPRECIPITATION of copper sulfides f
急求纯手工翻译!谢谢各位!
一introduction
precipitation of copper sulfides from moderate-temperature, moderate- to high-salinity, oxidized fluids at oxidationreduction interfaces has been common since the paleoproterozoic. the largest known deposits occur within sedimentary basins, generally at the contact between subaerial red-bed sequences and overlying marine or lacustrine shales, siltstones, sandstones, or carbonate rocks. deposits in such settings have been termed sediment-hosted stratiform copper deposits (kirkham, ***) or sedimentary rock-hosted stratiform copper deposits (cathles and adams, 2005).
sedimentary rock-hosted stratiform copper deposits consist of relatively thin (generally <30 m and commonly <3 m) sulfide-bearing zones that are peneconcordant with lithologic layering. the deposits occur in a variety of sedimentary rock types with a variety of reductants. the configuration of the mineralized zone ranges from sheetlike, with extensive horizontal dimensions, to tabular or roll-front geometries, with limited horizontal dimensions (kirkham, ***).
二basin architecture of the sedimentary rock-hosted stratiform copper deposits
sedimentary rock-hosted stratiform copper deposits are the products of evolving basin-scale, or at least sub-basin-scale, fluid flow systems. similar to all ore systems, these deposits can be thought of as the end products of processes involving a source(s) of metal and sulfur, a source(s) of metal-transporting fluid, transport paths, possible mobile reductants, a thermal or hydraulic pump, and the chemical and physical factors that result in precipitation (“trapping”) of the sulfides. whereas the general nature of the ore fluids responsible for the formation of these deposits is clear (rose, 1976; brown, 1992), exact fluid compositions in terms of metal and sulfur contents are not known due to a lack of fluid inclusion data (hitzman et al., 2005). this lack of data is the result of the absence of suitable coarse minerals, containing workable fluid inclusions, intergrown with sulfides in the vast majority of deposits.
三critical factors for the formation of sediment-hosted stratiform copper deposits
sediment-hosted stratiform copper deposits require oxidized metal source beds (red beds), reduced facies to serve as metal traps, and saline brines capable of leaching and carrying metals. to form significant deposits, mineralizing fluids must be confined within the red beds and expelled through relatively focused zones, often in areas of stratal pinch out or linear structural zones. potentially productive host rock sequences and geometric configurations are commonly found in rift basins.
zbkzbk1年前1
东南下 共回答了19个问题 | 采纳率94.7%
一言 从铜的硫化物沉淀中温,中到高盐度,氧化还原界面在氧化液已普遍古元古代以来.探明储量最大的沉积盆地内出现,一般在陆上之间的红层上覆海水或序列和湖相页岩,粉砂岩,砂岩,碳酸盐岩或接触.在这样的设置存款已被称...
修改句子s语法,During the experiment,the copper was totally burned
修改句子s语法,
During the experiment,the copper was totally burned black and the sulfur became yellow steam,because of the hot temperature,it produced water and vapor.The result of this experiment was the weight before heating is greater than after heating due to the oxygen pressure and the broken molecules lost weights.
To clarify the above data,it showed the chemical changes between the initials and the consequences of mass after heating it.
The reactants above showed us the chemical and physical changes during the experiment.
The above class data demonstrated the total reactant,the total product,and the change of mass of each group.Some changes were extremely small which Group 16 was.Each of them had different chemical reactions because of their molecule structures.A great job for this lab was to remain small changes by doing each step correctly.
In case Group 16,the greatest result of this synthesis,the change of mass did not increase a lot which meant they preserved the law of conservation of mass using copper and sulfur.In case Group 1,the change of mass increased four time of Group 16 so the gap was great big difference.
t is to identify potential sources of error in the experiment.My average of mass was 2.53g and the percentage of error was 10.90%.The average (change in mass) for the class was 0.57g and the source of error was 1.99%.The answers might not be accurate because there was not exact answer for quantitative chemical,and we just want to know the approximate figures.
华铪1年前2
xzliang9521 共回答了20个问题 | 采纳率90%
During the experiment, the copper was totally burned black and the sulfur became yellow liquid. The process produced water and vapor, because of the hot temperature. The result of this experiment was the increase of the weight due to the oxygen pressure and the broken molecules lost weights.
To clarify the above data, it showed the chemical changes between the initials and the consequences of mass after heated.
The reactants above showed the chemical and physical changes during the experiment.
The above class data demonstrated the total reactant, the total product, and the change of mass of each group. Some changes were extremely small such as Group 16. Each of them had different chemical reactions because of their molecule structures. A great job for this experiment was to remain small changes by doing each step correctly.
In case Group 16, the greatest result of this synthesis, the change of mass did not increase a lot which meant they preserved the law of conservation of mass using copper and sulfur. In case Group 1, the change of mass increased four time of Group 16 so the gap was a great big difference.
It is to identify potential sources of error in the experiment. My average of the mass was 2.53g and the percentage of error was 10.90%. The average (change in mass) of the class was 0.57g and the source of error was 1.99%. The answers might not accurate because there was not exact answer for quantitative chemistry, and we just want to know the approximate figures.
铜的化学元素符号是什么简写过来的,它的英语翻译是Copper
草和花说我爱你1年前5
hsmei 共回答了21个问题 | 采纳率95.2%
是从拉丁语:Cuprum 简写的.世界上虽说英文是通用语言,但学术界都是以拉丁语为标准的.
copper 和brass的区别
copper 和brass的区别
请问这两种铜有什么区别,用肉眼可以区分吗?若可以,怎么区分
用brass做出来的东西,含铜量不同,若分别经过酸洗,其颜色是不是会有所不同?
另请问copper和brass做出的东西经过酸洗出来,颜色是否有不同?
怎么样区分不同含铜量的黄铜?比如H59,H62,H65,H68,怎么区分他们?不是说检测它们,而是用肉眼,用一些常规的方法能不能看出它们的区别?
换句话说,用什么方法可以看出哪些是含铜量高点的黄铜,哪些是含铜量低点的黄铜呢?
阿杰啊1年前1
哈利1 共回答了19个问题 | 采纳率78.9%
copper是指红铜,即纯铜,顾名思义,外观红色,有金属光泽,延展性和导电性,有金属特征.brass是指黄铜,即铜和锌的合金.顾名思义,外观黄色,也有金属光泽和一般金属特性.所以:1)两者可以肉眼区分,因为两者颜色不同.2)两者含铜量不同,copper是100%铜(自然界完全纯净物时不存在的,这只是说纯度很高),brass是Zn和Cu的合金,相同体积时,铜含量没有copper高.3)Zn和Cu分别在金属活动顺数表当中的H前后,故用酸处理,copper是不反应的,颜色也不改变.而brass中的锌会跟酸反应,随着Zn反应而含量的减少,brass颜色会慢慢变红.
LIME,SODA,POTASH,STRONTIAN,BARYTES,ZINC,COPPER,LEAD,PLATINA,
LIME,SODA,POTASH,STRONTIAN,BARYTES,ZINC,COPPER,LEAD,PLATINA,MERCURY中哪些不是化学元素
梦的彩虹1年前3
lalayxy 共回答了21个问题 | 采纳率90.5%
lime 石灰
soda 碳酸水
potash 碳酸钾
strontian 锶
barytes 硫酸钡
zinc 锌
copper 铜
lead 铅
platina 铂
mercury 汞
综上
lime 石灰
soda 碳酸水
potash 碳酸钾
barytes 硫酸钡
这四个不是化学元素.
[我也在做那化学的调查研究作业.]
copper (II) sulfate pentahydrate能溶于水吗?
STENCILs1年前1
fyine 共回答了26个问题 | 采纳率88.5%
copper (II) sulfate pentahydrate就是5水硫酸铜,可以溶于水,20度时,溶解度为100克水溶20.7克无水硫酸铜
copper(2) sulfate pentahydrate 能溶于水吗?
copper(2) sulfate pentahydrate 能溶于水吗?
能溶于水吗?
ki841年前1
英雄事实 共回答了21个问题 | 采纳率90.5%
五水硫酸铜,溶啊~~~~
The actual figure was made of copper supported by a metal fr
The actual figure was made of copper supported by a metal framework which had been especially ..
The actual figure was made of copper supported by a metal framework which had been especially constructed by Eiffel.
其真实轮廓是由金属框架支撑的铜所构成,他已经由埃菲尔特别建造结束.
这么翻译对吗?
had been especially constructed,是个过去的被动语态,不是应该翻译成已经被..完成的意思吗?
chen832502451年前2
南海渔人 共回答了22个问题 | 采纳率95.5%
其现有的轮廓是由金属框架支撑的铜所构成的,这个金属框架是由埃菲尔专门建造的.
"Copper your customers and grow rich" THIS is an old adage.w
"Copper your customers and grow rich" THIS is an old adage.who can help me translate it to Chinese?Thanks a lot.
huangxianzhuo1年前1
有风有雨好种田 共回答了10个问题 | 采纳率100%
照顾好你的客户你就会变富
求解几道英文化学题1)The binding energy of electrons to copper metal i
求解几道英文化学题
1)The binding energy of electrons to
copper metal is 383.0 kJ/mol. What is the longest wavelength of light that will
eject electrons from copper metal? Enter units
2)Microwave ovens heat food by creating microwave electromagnetic radiation that
is absorbed by water molecules in the food. Any material that does not have
water in it will not absorb the radiation and will not get hot. Metals reflect
the microwaves from their surfaces and disrupt the operation of the oven. Some
Australians heat water in microwave ovens to make tea. What is the minimum
number of microwave photons with a wavelength of 3.22 mm that will have to be
absorbed by a 122.00 gram sample of water to heat it from 25°C to 100°C? (It
requires about 315 joules of energy to heat 1 gram of water 75°C)
3)What is the wavelength (in nm) of an electron with v = 9.2x 105
m/s?
4)Calculate λ (in nm) for a photon with E = 2.83x10-15 J?
5)Give the number of unpaired electrons in F−.
deeryao0011年前3
tmtytmty 共回答了9个问题 | 采纳率100%
1)hc/λ>383×10^3/NA
h:普朗克常数6.63×10^-34J·s,c:光速3×10^8m/s,λ:光子波长,NA:阿伏伽德罗常数6.02×10^23
解得波长<3.13×10^-7m,即313nm
2)意思就是微波加热需要有水分子,如果没有水而是金属的话会反射微波损坏微波炉.
1个3.22mm微波光子能量E=hc/λ=6.18×10^-23J
122g水从25℃加热到100℃需要热量为122*315=38430J
需要的微波光子的数量最少为:38430/6.18×10^-23=6.22×10^26个
3)根据德布罗意波长公式λ=h/mv=6.63×10^-34/(9.11×10^-31*9.2×10^5)=7.94×10^-10m=0.794nm
公式中m:电子质量9.11×10^-31kg,v:电子运动速率,h:普朗克常数
4)根据爱因斯坦光子理论E=hc/λ,算出λ=7.03×10^-11m=0.07nm
5)F-(是氟离子吧)未成对电子数为0,就是说所有电子都是成对的.
‍ 急求翻译:请看附件图纸,由于COPPER TERMINAL的供应商忘了更尺寸A为12.5MM。导致实物C
‍ 急求翻译:请看附件图纸,由于COPPER TERMINAL的供应商忘了更尺寸A为12.5MM。导致实物COPPER BUSB 中A的尺寸变成15.5MM。对此我们感到抱歉。我们试组装了一个产品,因为铜丝是柔软的所以我们认为并不会影响你们组装到PCB里。请确认是否可以这批COPPER BUSB?下一批一定会我们会更正过来。有任何问题请联系。谢谢
jiangchaoyu1年前1
东方丹朔 共回答了17个问题 | 采纳率88.2%
In my mind, there is a heavy one and the same as the name of the mother, it is my homeland.
My country has splendid traditional culture; a magnificent great rivers and mountains; has a long histo...
英译汉,求教!Every copper pipe and bend for steam or feed water se
英译汉,求教!
Every copper pipe and bend for steam or feed water service shall be carefully annealed before fitting and thereafter at intervals of not more than four years of working life.
不要有道谷歌,
洒上空枝见血痕1年前4
y3_mujin2000 共回答了21个问题 | 采纳率95.2%
每一个用来输送蒸汽或者给锅炉输送水的直铜管和弯位都必须经过严格的煅烧才能安装,并且最多长每4年就应该更换.
conducts,silver,and,so,electricity,does,copper连词成句
想念常苏1年前2
袁杰伟 共回答了14个问题 | 采纳率85.7%
Copper conducts electricity and so does silver
铜导电,银也是.
或者
Silver conducts electricity and so does copper
银导电,铜也是.